Abrading reamer



J. Dxsco ABRADING BEAMER Nov. 8, i938.

Filed Dec. 10,.v 1934 Y INVENTOR. faQ-v ./sco

ATTORNEY.

Patented Nov. 8, 1938 UNITED STATESv PATENT OFFICE 2,135384 ABRADING ias-AMER Joseph Disco, Santa Ana, Calif. Application December 10, 1934, Serial No. '756,869 .5 claims. (o1. 5'1 1s4.3)

This invention relates to an improvement in an expansible abrading reamer.

It is an object of the invention to improve upon a device of the character stated, in a number of respects, among which are with regard to superior means for detachably supporting a sheet of abrading material in a secure manner upon the device; to provide improved means for expanding a sleeve-like sheet of abrading material; to provide, in combination with other cooperating parts, an improved expansible split sleeve for having mounted upon it a sheet of abrading material; and to otherwise improve certain portions of the structure as will hereinafter more fully appear.

Referring to the accompanying drawing, which illustrates what is at present deemed to be a preferred embodiment of the invention,

Fig. 1 is an elevational view of the device, with a part of the exterior structure broken away to line I-I of Fig. 6 to disclose the underlying construction.

Fig. 2 is a side elevation of the arbor.

Fig. 3 is a side elevation of one of the tapered slips which form a part of the expanding means.

Fig. 4 is a top plan view of the slip shown in Fig. 3. f

Fig. 5 is a top plan view of the structure shown in Fig, 1.

Fig. 6 is an enlarged cross section, the plane of section being indicated by the line G-I on Fig. 1.

Fig. 7 is a fragmental enlarged sectional view of Fig. l, showing the upper ends of the slips and the split sleeve in the expanded position.

Referring in detail to the drawing, the arbor 2 has at one end a shank 3 provided with a polygonal terminal portion 4 to adapt it to be securely held by any suitable means of rotation, or whereby it may be securely held against rotation while the work is rotated about said arbor.

Said arbor has a diametrically enlarged portion 5 into the periphery of which are formed portions of a plurality of circumferentially spaced hori- Zontal grooves or guides 6 to receive the tapered expanding slips or Wedges 1. Said grooves have inclined bottoms, and said slips are T shaped as viewed in cross section, having each an inner flange 8 to t within one of the grooves, and at the outer sides oppositely directed flanges 9 forming a head. Said inner flanges 8 are each tapered from end to end in such a way as to decrease gradually in breadth and thus form an inclined plane in order to secure the gradual wedging effect desired. The groove for each slip has its bottom inclined in such a way as to double the wedging eifect produced by the sliding thereover of the slip. The wide end of the flange 8 of each slip terminates at a distance from the end ofthe slip, but the opposite end of said flange preferably extends to the extremity of the slip.

The enlarged portion 5 of the arbor is shown as being of a uniform diameter from end to end between the grooves thereof, the taper or slope being confined to the bottoms of the grooves E5. All the arbor parts shown in Fig. 2 may be made in one integral piece.

In a longitudinally spaced relation to the enlargement 5 is shown another shorter diametrical enlargement, or head, II and between said enlargements 5 and Il intervenes an arbor section l2 having a uniform diameter which is intermediate the diameters of the shank of the arbor and its enlargements II and 5. The grooves 5 extend the entire length of the three enlarged portions of the arbor, and their bottoms decrease somewhat in depth at one end within 1he head II, as indicated at I3. This groove portion I3 is preferably shaped to match up with a cut away part I4 of each slip flange or rib 8.

Not far from its polygonal extremity 4 there is secured to the arbor a stop sleeve I5 having at its outer extremity a thick internal annular flange I6 which receives the pin Il whereby said stop sleeve is secured to the arbor. The space between said internal annular flange and the opposite end of the sleeve is occupied by a spiral compression spring I8, said spring projecting a considerable distance beyond the inner end of the sleeve. Around the projecting portion of said spring and also over the adjacent part of the sleeve I5 is slidably fitted a follower sleeve IS one end of which is shown beveled at 2I and the other end of which is provided with an internal annular ange 22 that slidably engages the shank of the mandrel, said flange forming an abutment for one end of the spring I8, the opposite end of said spring engaging the outer end Wall I6 of the stop sleeve I5.

This arrangement causes the inner end of the slidable sleeve I9 to abut yieldingly against the adjacent ends of all the slips 1, said sleeve slipping back when the slips are forced toward that end of the arbor. Such a movement of the slip is effected by means of an adjusting sleeve or nut 23 which screws on to the reduced threaded portion 24 of the arbor the diameter of which threaded portion being such that the bottoms of said grooves 6 lie outside the periphery of said threaded portion so that said grooves do not vextend into said threaded portion and cut the threads thereof.

'I'he slips 1 are restrained from radially outward displacement, in part, by the split sleeve 25, preferably of Bakelite, which is closely fitted over them. The slips form a mounting means for said sleeve, and by sliding the slips as above indicated said split sleeve is diametrically expanded to the desired extent.

Over said sleeve is fitted a sheet 26 of material having an external coating of abrasive material. Said sheet has opposite infolded edge portions 28 which overlie the edges of the sleeve 25 split circular ring 36 extends through the apertures 35 to retain the slips in their operative position and yet permit them to slide lengthwise ofthe arbor. This springv ring 36 is sufliciently large to encircle the arbor portion I2.

One of the slips (see Fig. 6,) is furnished with an outward projection 3'! which enters the split of the split sleeve 25 to. keep said sleeve from rotating independently of the arbor. The side portions of this slip press against the limbs 32 of the clips 29 and thus aid them in their sheetgripping functions.

The follower sleeve I9 has its inner end cupped at 40 and this cupped part registers with the bevels 4I on the adjacent sleeve end, while at 2 the opposite ends of the slipsthe adjusting sleeve 23 is likewise cupped at 42 to engage the sleeve bevels 43.

By adjusting the internally screw threaded sleeve or nut 23 to the desired position with relation to the length of the arbor and thus sliding the tapered slips in their grooves against the opposition of the spring I8, the sleeve 25 and abrading sheet 26 maybe varied in diameter to apply the proper amount of abrasive action to the surface of any bore to be polished or reamed out to a larger size.

The split sleeve 25 and abrading sheet 26 combined with the retaining clips 29 are deemed to constitute a new article of manufacture applicable to other rotatable reaming devices than the reamer which has been described.

I claim:

1. In a device of the kind described, an arbor having circumferentially arranged longitudinally extending guiding means, slips or wedges mounted upon said guides, said slips being longitudinally movable and constructed and arranged to form a mounting means which is varied in its external diameter by their longitudinal movement, and an abrading member consisting'of a split sleeve mounted upon said mounting means, at least one of said slips having an outward projection which enters the split in said sleeve to prevent relative rotation between said sleeve and said mounting means.

2. In a device of the kind described, an elongated arbor having for a portion of its length an enlargement of substantially uniform diameter, longitudinal grooves decreasing in depth towards one end of the arbor cut into said enlargement, expanding slips slidably mounted in said grooves, an expansible abrading sleeve mountable upon said slips in a circumscribing relation thereto, said arbor being formed at one end of said enlargement with a threaded end portion, a nut fitted on said threaded end portion for engaging vthe adjacent end of said abrading sleeve and the adjacent ends of said slips for moving said sleeve and said slips longitudinally of said arbor and 'said slips along said grooves for expanding said abrading sleeve, a follower sleeve slidably fitted on said arbor beyond the other end of said enlargement and engaging at its inner end the adjacent end of said abrading sleeve, the inner end of said follower sleeve being closed around said arbor, a stop sleeve secured on said arbor with its inner end telescopically extending into the outer open end of said follower sleeve, said stop sleeve being closed at its outer end and open at its inner end, and a coil spring surrounding said arbor within said follower sleeve and said stop sleeve, and bearing at its ends against the closed inner end of saidfollower sleeve and the closed outer end of said stop sleeve.

3. An abrading tool including a mandrel having a plurality of circumferentially spaced longitudinal grooves, the grooves having walls inclined longitudinally of the mandrel, slips movable longitudinally in the grooves and cooperating with said walls, said slips being of T-shape in cross-section with one flange thereof disposed in one of the said grooves, a split tubular member supportedby the slips and having a cylindrical periphery, an abrasive element on the periphery of the member, and means for shifting the slips in the grooves to expand the member.

4. In a device as disclosed, an elongated arbor having external longitudinal grooves decreasing in depth towards one end of said arbor, tapered expanding slips slidably mounted in said grooves, said slips being T-sh-aped in cross section with their T-heads at their outer edges forming bearing surfaces, means for sliding said slips in said grooves for moving said slips outwardly of said arbor, and an expansive abrading sleeve surrounding said slips and engaging the outer bearing surfaces of the T-heads of said slips.

5. An abrading tool including a mandrel having a plurality ofcircumferentially spaced longitudinal grooves, the grooves having walls inclined longitudinally of the mandrel, slips having anges movable longitudinally in the grooves and cooperating with said walls, said slips having heads wider than the flanges, a split tubular member supported by said heads land having a cylindrical periphery, an abrasive element on the periphery of said member, and means for shifting the slipsin the grooves to expand the member.

. JOSEPH DISCO. 

